Spark-plug.



H. N. EASTMAN..

SPAHKPLUG.

APPLICATION FILED APR. 22, 1915.

Patented Aug. 14, 1917.

D. 3mm/Mop l f bm.) @www simi/bwa 1 Ju-1 proviclefl wim.

To @ZZ 'wmm may cof/wem,

Be it known illes L HARRY citizen of the United Smiles, i" Y Deyten, in the eeunty of'li/ieiitgemery' enel State of hio, lieve in'vente and useiil lmprovemens in p el 1 I (Cese 3,) of which the 'following is e speel- My invem'zm relates io explosive engines and more perieiilerly te' igniion 'er spe-rk l plugs therefor. A

The object oi 'elle inyentieii is izo simplify the 'structure es well es the ineens smi mefe ei* operation of suoli devices Wheeby liey will noi, only be eheaperreel in eoiiseruetionv but Will be m re eioierrt ir; iisej eepzlble o' being easily enel quieklTlv assemblee. clisesserilulefia compression zig-lit, unlikely to gee our, of repair.

Wiih 'the above primery enel other imeiclental objects in 'Viewj es will more fully eppeer in the speeilee'bien, invention eenw siste ef elle features or" eonsrueeion, the parte enel combinations thereof, lie mode el epemiiom er eheir equiveleiis, as hereinafter described and set orili iii lle claims. Referring to, elle drawings, l is e. side elevation ei the assemblee?. speri; plu?. Fig. 2 is e longitudinal sectional View thereof. Fig. 3 is e bottom plan View lreree.

Like parte ere indicated. by similar slieraeiers. of reference ilirouffliouthe eral Views.

ln fiche lrewiigs is the me. comprising e, hexagonal heeel lie' i threadefl extension 2 adapted in the Wall or" the engine fr' tien chamber tliereoii. The ieneme bushing or @there end eommunieeemg wili eylinder or ignitien Chamber Cormier bored te form 'liereiri e seat or slimilder lrrsei'tecl Within the bushing irom ini-ie or screw threedeel epfl 'thereof is e @ere @E porcelain., leve5 fire clay, or some sii materiel. This core l is previclerl Wizlr i peripheral flange er integral l efle'e'- ed te loe seeiel upon the shoulder B oi epee an interpeseel gasket or Washer oi copper er other eee resieiiiiig peeiih,C ieriaL The screw 'lireeclecl extension iiiieriiel lireels te 'receive e peokiiig gland er sleeve C7 which surreeiie the insulairig eore is screw 'lireeileil Within 'h-lie mei bushing Where ii. serves o firmly seed; ii irisiileirg cere e gl l or sem?J '7 le ki gasket 8 likewise N' otlie heee resisting meieriel lie linner end of lie' aimee or coller 5 or theleore L e er celle?? er flange of lie -sueeiiig; cere upeine seat 3 with elle Lie ese1 gesies or Washers- 0I" packing ferm. ee oressioii zigl'lf, oint adfee i s i end of elle spark plug. le is te loe iietee diet iii lieu er elle usual coli- 'slvrue'gioii which the jeins between the j' other eoie and the bushing or necessarily rurzmge to resis ef the ezzplesive eherge, in the lie relation of the parte is refrore ilu-ie usually employed, the core bei@ intrede/ceri freie the iimei erlcl of the bushing joini; so arranged that iiiseefl ef the pressure the explosive charge to open the joint alie seid pressure in elle presen'iinsteriee would merely tend to seat lie core more iirrnly upon its seail 3 and compress the peeking me'terieL The pressure of elle explosive charge is thereby utiliz-f to more securely seal lle .joint ,se leakage., The core fl is slightly redeeef iii cliemeter above elle flange or col-l ler 5 o form an olse'e or shoulder 9. Pro jeetiiig; Within mille bushing and sur wending' lie cere is e sleeve l0 of ber or ell-ler insular-ing mai-ferial seated upon the offset slioirler many spark plugs iiow in use "eiie pereelein er other insulating cere projeets beyond lie bushing or main lreusing and is openly exposed. Spark plugs, being; subject lo more or less rough ris-ege, elle exposed portion of the porcelain core is irequenly broken, .thereby either de- 'lfeyiiig eneirely or materially decresillg c; eieieney of spark plug. In the seance e sleeve or coller l1 of hard 5 eer'j er other insulating material. surreale-ils lle protruding end of ille core 4 and sleeve 'l0 and reses upen "she upper face ef main besli This sleeve 1l projee-s some Tlie': eey dv alle extremiizy of the L irougli the core 4 is an ing bolt which the several are clamped tiglrtly together i pendei'n'; or the packing @land i"he construction is suchthat eve though the porcelain sleeve 1- may be cracked or broken the bolt like electrode i2 Wiil hold such broken parts closely in contact one with the other to prevent the arcing of the current through the cracks or openings. At its eXtreme end the stem of the electrode carries a binding nut 16 for the attachment oif' the circuit Wires. The head 13 of the bolt-like electrode is substantially cylindrical in form, although a fiat sided or polygonal head might be employed in lieu thereof. Projecting from the packing gland 7 is a second electrode, the terminal of which is bent `laterally toward the head 13 and is flattened to form a broad sparking foot i7 in lieu of the usual point. It is found in practice that this construction aiiords a broad spark et great intensity.

From the above description it will be apparent that there is thus provided a device of the character described possessing the particular :features of advantage before enumerated as desirable but Which obviously is susceptible of modification in its form, proportion, detail construction, or arrangement of parts, Without departing from the principle involved or sacrificing any of its advantages.

While in order to comply with the statute the invention has been described in language more or less specific as to certain structural features, it is to be understood that the invention is not limited to any specie details but that the means and construction herein described comprise but one mode of putting the invention into effect and the invention is therefore claimed broadly in any of its possible forms or modifications Within the scope of the appended claims. j

Having thus described my invention, I claim:

1. A spark plug comprising a main bushing having its inner end counterbored to `form an integral seat, a core of non-conductive material introduced into thev bushing from the inner end thereof, a peripheral shoulder on the core engaging withV the shoulder Within the bushing, a second shoul-v der on said core, a sleeve of insulating material Within the bushing seated on said second shoulder of the core and an electrode comprising a bolt extending through the core and having a bearing upon the main bushing adapted to draw the core into en-` gagement withv its seat Within the bushing.

2. A spark plug comprising a bushing having an offset or shoulder therein7 a shouldered core of non-conductive material introduced into the bushing from its inner or high v"pressure side and engaged With the shoulder of the bushing, a bolt forming one electrode of the spari: plug extending through the core,'adj listing means carried by the stemoia the electrode, a sleeve of nonconductive material bearing upon the main bushing and engaged by the adjusting means, and a second electrode in electrical communication with the bushing.

3. A spark plug comprising a main bushing having an interior peripheral seat therein, a core of non-conductive material having a peripheral flange extending Within the bushing and engaging the interior peripheral seat thereof, a sleeve of insulating material extending Within the bushing and surrounding the core, a second sleeve of insulating material concentric with the core bearing at one end upon the bushing, a bolt forming one electrode extending through the core and sleeve last mentioned, and a nut screw threaded upon the bolt and bearing upon the last mentioned sleeve.

4. A spark plug comprising a bushing, an integral oil-set seat or shoulder formed therein by counterboring the inner or high pressure side of the bushing, a: shouldered core of insulating material introduced into the bushing from its inner or high pressure side with the shoulder of the core and that of the bushing coacting to limit the relative movement of the bushing and core in one direction, a sleeve surrounding said core and bearing upon the outer face of the bushing, adjusting means carried by the core and engaging the sleeve which serves as an abutment to draw the shoulders of the core and bushing one toward the other, and independent electrodes supported by the core and bushing substantially as specified.

5. A s ark plug comprising a bushing, an integ al offset seat or shoulder formed therein by counterboring the inner or high pressure side of the bushing, a shouldered core of insulating material introduced into the bushing from its Vinner or high presy, sure side with the shoulder of the core and that of the bushing coacting to limit the relative movement of the bushing and core in one direction, independent telescopic sleeves of insulating material surrounding said core, adjusting means for relatively moving the core and bushing to cause the shoulders of said members to approach one toward the other and independent electrodes supported by the core and bushing to cause the shoulders of said members to approach one toward the other, and independent electrodes supported by the core and the bushing respectively.

6. A spark plug comprising a bushing, an integralseat or shoulder therein formed by counterboring the inner or high pressure side of the bushing, a core of insulating material introduced into said bushing from the inner or high pressure side, a peripheral seat or shoulder formed upon Said core,

said com and bushing' sii to 11mm the reiazzwe movemen; oi'

- members in one direcion, means im "bin fail@ @mimgei disk like sectrode, 3,0 n aiiy as specified n c-simony whereof, li have hereunto set hand this 19th day of April, A.. D. 1915.

HARRY N. EASTMAN.,

imesses ROBERT 53. CQWQEN,

CARRE liECKER. 

